216439489 has 16 divisors (see below), whose sum is σ = 256398336. Its totient is φ = 178790400.

The previous prime is 216439477. The next prime is 216439501. The reversal of 216439489 is 984934612.

216439489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216439477) and next prime (216439501).

It is a cyclic number.

It is not a de Polignac number, because 216439489 - 2¹⁵ = 216406721 is a prime.

It is a super-2 number, since 2×216439489² = 93692104797162242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216439429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53829 + ... + 57709.

It is an arithmetic number, because the mean of its divisors is an integer number (16024896).

Almost surely, 2^216439489 is an apocalyptic number.

It is an amenable number.

216439489 is a deficient number, since it is larger than the sum of its proper divisors (39958847).

216439489 is a wasteful number, since it uses less digits than its factorization.

216439489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4176.

The product of its digits is 373248, while the sum is 46.

The square root of 216439489 is about 14711.8825783786. The cubic root of 216439489 is about 600.4066585783.

The spelling of 216439489 in words is "two hundred sixteen million, four hundred thirty-nine thousand, four hundred eighty-nine".